Well you're supposed to wait a day or 2 before replying
It depends. First, if you have kids then ALWAYS be responsive to your spouse on anything related to the kids. Going dark doesn't apply when you're talking about kids.
Second, the rule is not to wait a day or two on unimportant non-kid stuff, it's to vary things. Sometimes reply right away. Sometimes wait a day or two. Sometime don't reply at all. The idea is to make her wonder what you're up to in your new life. Act distracted, like you've got other things going on. If she calls then talk pleasantly, but always be the first to make an excuse to get off the phone. If you're dropping the kids off then always look your best, like you must have someplace to go afterwards. Get busy, get a life. Let you wife see peeks of your GAL efforts so she knows your world no longer revolves around her. Send her a message through your ACTIONS that you are going to live your life and live it well, whether with or without her.
Also another comment on going dark, for those that were emotionally detached in the M, going dark is going to be perceived by your spouse as "more of the same" behavior. It will NOT help your sitch. Michelle warns about this in DR. Only consider going dark if it is a true 180.